제출 #1041847

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1041847		MMihalev	구슬과 끈 (APIO14_beads)	C++14	컴파일 에러	0 ms	0 KiB

beads

#include<iostream>
#include<algorithm>
#include<iomanip>
#include<cmath>
#include<cstring>
#include<vector>
#include<queue>
#include<stack>
#include<tuple>
#include<set>
#include<map>
#include<random>
#include<chrono>
#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
using namespace std;
const short MAX_N=1e4+1;
const int INF=2e9+1e8;
int dp[MAX_N][2];
short n;
vector<pair<short,short>>g[MAX_N];
short j;
void reset()
{
    for(j=1;j<=n;++j)
    {
        dp[i][0]=0;
        dp[i][1]=-INF;
    }
}
void dfs(short u,short par)
{
    int sum=0,cur;

    for(auto [v,edge]:g[u])
    {
        if(v==par)continue;
        dfs(v,u);

        sum+=max(edge+dp[v][1],dp[v][0]);
    }

    for(auto [v,edge]:g[u])
    {
        if(v==par)continue;

        cur=max(edge+dp[v][1],dp[v][0]);
        dp[u][1]=max(dp[u][1],sum-cur+edge+dp[v][0]);
    }
    dp[u][0]=sum;
}
signed main ()
{
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
    cin>>n;
    for(short i=1;i<n;i++)
    {
        short u,v,c;
        cin>>u>>v>>c;
        g[u].push_back({v,c});
        g[v].push_back({u,c});
    }
    int ans=0;
    short r;
    for(r=1;r<=n;++r)
    {
        reset();
        dfs(r,0);
        ans=max(ans,dp[r][0]);
    }
    cout<<ans<<"\n";
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

beads.cpp: In function 'void reset()':
beads.cpp:27:12: error: 'i' was not declared in this scope
   27 |         dp[i][0]=0;
      |            ^
beads.cpp: In function 'void dfs(short int, short int)':
beads.cpp:35:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   35 |     for(auto [v,edge]:g[u])
      |              ^
beads.cpp:43:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   43 |     for(auto [v,edge]:g[u])
      |              ^